Coating material and preparation method thereof, heat exchanger and method for treating heat exchanger

Abstract

The present disclosure relates to the technical field of material and heat exchange and in particular, to a coating material applied to a heat exchanger, a method of preparing the coating material, a heat exchanger, and a method of treating the heat exchanger. The coating material of the present disclosure applied to a heat exchanger includes a hydrophobic material and a light-to-heat conversion material. Under irradiation of visible light, the light-to-heat conversion material can effectively increase the surface temperature of a coated object, which is beneficial to increasing the surface temperature of the coated object while exerting the hydrophobic performance of the hydrophobic material, thus further improving the effect in slowing down frosting.

What is claimed is: 
     
         1 . A coating material for coating a heat exchanger, comprising a hydrophobic material and a light-to-heat conversion material. 
     
     
         2 . The coating material according to  claim 1 , wherein a dosage of the hydrophobic material is 92 to 98.5 parts by mass and a dosage of the light-to-heat conversion material is 0.5 to 3 parts by mass. 
     
     
         3 . The coating material according to  claim 1 , wherein the coating material further comprising a dispersant;
 wherein a dosage of each component in the coating material is as follows: a dosage of the hydrophobically material is 92 to 98.5 parts by mass, a dosage of the light-to-heat conversion material is 0.5 to 3 parts by mass, and a dosage of the dispersant is 1 to 5 parts by mass.   
     
     
         4 . The coating material according to  claim 1 , wherein the light-to-heat conversion material comprises at least one of nano copper oxide, a spinel material, a nano carbon material, a conjugated polymer, black phosphorous, and a noble metal nanomaterial. 
     
     
         5 . The coating material according to  claim 1 , wherein the hydrophobic material is a hydrophobically modified silica sol. 
     
     
         6 . The coating material according to  claim 3 , wherein the dispersant comprises at least one of a polymer dispersant, an anionic wetting dispersant, a cationic wetting dispersant, a non-ionic wetting dispersant, an amphoteric wetting dispersant, and an electrically neutral wetting dispersant. 
     
     
         7 . A preparation method of a coating material for coating a heat exchanger, comprising:
 providing a hydrophobic material and a light-to-heat conversion material; and   mixing the hydrophobic material with the light-to-heat conversion material to obtain the coating material.   
     
     
         8 . The preparation method according to  claim 7 , wherein the providing a hydrophobic material comprises:
 mixing 10 to 50 parts of organosilane and/or siloxane by mass, 45 to 89 parts of a solvent and 1 to 5 parts of hydrophilic silica by mass, and stirring for 15 to 45 min at a temperature of 30° C. to 45° C. with a stirring speed of 200 to 500 rpm, to obtain the hydrophobic material.   
     
     
         9 . The preparation method according to  claim 8 , wherein the method comprises at least one of the following features (1)-(3):
 (1) the organosilane comprises at least one of hexamethyldisilazane, methyltriethoxysilane, dimethyl diethoxysilane, trimethylchlorosilane, dimethyldichlorosilane, and γ-glycidoxypropyltrimethoxysilane;   (2) the solvent comprises an alcohol solvent; or   (3) the hydrophilic silica comprises at least one of fumed silica particles and a dispersible silica sol.   
     
     
         10 . The preparation method according to  claim 7 , wherein the method comprises at least one of the following features (1)-(3):
 (1) a dosage of the hydrophobic material is 92 to 98.5 parts by mass and a dosage of the light-to-heat conversion material is 0.5 to 3 parts by mass;   (2) the light-to-heat conversion material comprises at least one of nano copper oxide, a spinel material, a nano carbon material, a conjugated polymer, black phosphorous, and a noble metal nanomaterial; or   (3) before the mixing the hydrophobic material with the light-to-heat conversion material to obtain the coating material, the method further comprises: adding 1 to 5 parts by mass of a dispersant.   
     
     
         11 . A heat exchanger, comprising:
 a metal base defining a heat exchange channel for flowing at least one of a refrigerant and a coolant therein; and   a coating layer coated at least a part of an outer surface of the metal base;   wherein the coating layer comprises a light-to-heat conversion material.   
     
     
         12 . The heat exchanger according to  claim 11 , wherein the heat exchanger is a micro-channel heat exchanger, the metal base comprising:
 a first header defining a first inner cavity;   a second header defining a second inner cavity; and   a plurality of heat exchange tubes connecting between the first header and the second header, each heat exchange tube defining a third inner cavity in fluid communication with the first inner cavity and the second inner cavity;   wherein the first inner cavity, the second inner cavity and the third inner cavity forms the heat exchange channel.   
     
     
         13 . The heat exchanger according to  claim 12 , wherein said metal base comprises a plurality of fins each sandwiched between two adjacent heat exchange tubes, and at least part of an outer surface of the header, the heat exchange tube and the fin is loaded with the coating layer. 
     
     
         14 . The heat exchanger according to  claim 12 , wherein a length direction of the first header is parallel to a length direction of second header, a length direction of heat exchange tube is perpendicular to the length direction of first and second headers, and
 wherein the plurality of heat exchange tubes are arranged along the length direction of the header, the dimension of the length of the heat exchange tube is greater than the dimension of the width of the exchange tube, and the dimension of the width of the heat exchange tube is greater than the dimension of the thickness of the exchange tube.   
     
     
         15 . The heat exchanger according to  claim 12 , wherein said fin is a corrugated shape fin extending along the length direction of the heat exchange tube, the fin comprising:
 a plurality of fin units connecting between two adjacent heat exchange tubes;   a plurality of wave crests connecting with one of the two adjacent heat exchange tubes; and   a plurality of wave valleys connecting with the other one of the two adjacent heat exchange tubes;   wherein the wave crests and the wave valleys are retained to the two adjacent heat exchange tubes.   
     
     
         16 . The heat exchanger according to  claim 11 , wherein the outer surface of the metal base has an uneven rough surface, a roughness of the rough surface is denoted as Ra meeting with the following relationship: 0.5 μm≤Ra≤10 μm, and the coating material covers at least a part of the rough surface. 
     
     
         17 . The heat exchanger according to  claim 12 , wherein the third inner cavity defines a plurality of micro channels. 
     
     
         18 . The heat exchanger according to  claim 11 , wherein the coating layer comprises a dispersant;
 wherein a dosage of each component in the coating material is as follows: a dosage of the hydrophobically material is 92 to 98.5 parts by mass, a dosage of the light-to-heat conversion material is 0.5 to 3 parts by mass, and a dosage of the dispersant is 1 to 5 parts by mass.   
     
     
         19 . The heat exchanger according to  claim 11 , wherein the light-to-heat conversion material comprises at least one of a nano copper oxide, a spinel material, a nano carbon material, a conjugated polymer, a black phosphorous, and a noble metal nanomaterial.